class Layer {
	constructor({height=600, width=800}) {
		this.drawCanvas = new Canvas({height, width});
		this.selectCanvas = new Canvas({height, width});
		this.active = false;

		const previewElement = document.createElement('div');
		previewElement.className = 'layer-preview';
		this.previewElement = previewElement;
	}

	setHeight({height}) {
		this.height = height;
		this.drawCanvas.setHeight(height);
		this.selectCanvas.setHeight(height);
		return this;
	}

	setWidth({width}) {
		this.width = width;
		this.drawCanvas.setWidth(width);
		this.selectCanvas.setWidth(width);
		return this;
	}

	resize({height, width}) {
		this.height = height;
		this.width = width;
		this.drawCanvas.resize({height, width});
		this.selectCanvas.resize({height, width});
		return this;
	}

	refreshPreviewElement() {
		this.previewElement.src = this.drawCanvas.toDataURL();
	}

}

class Layers {
	constructor({easelElement, controllersElement, height=600, width=800, backgroundColor=new Color(255, 255, 255)}) {
		this.backgroundColor = backgroundColor;
		this.height = height;
		this.width = width;
		this.easelElement = easelElement;
		this.controllersElement = controllersElement;
		this.zoom = 1;
		this.layers = [
			new Layer({height: this.height, width: this.width}).fill({color: this.backgroundColor}),
			new Layer({height: this.height, width: this.width})
		];
		this.activeIndex = 1;
		this.refresh();

	}

	setHeight({height}) {
		this.height = height;
		this.easelElement.style.height = `${height}px`;
		this.layers.forEach(layer => {
			layer.setHeight(height);
		});
		this.layers[0].fill({color: this.background});
		return this;
	}

	setWidth({width}) {
		this.width = width;
		this.easelElement.style.width = `${width}px`;
		this.layers.forEach(layer => {
			layer.setWidth(width);
		});
		this.layers[0].fill({color: this.background});
		return this;
	}

	getActive() {
		return this.layers[this.activeIndex];
	}

	resize({height, width}) {
		this.height = height;
		this.width = width;
		this.easelElement.style.height = `${height}px`;
		this.easelElement.style.width = `${width}px`;
		this.layers.forEach(layer => {
			layer.resize({height, width});
		});
		this.layers[0].fill({color: this.background});
	}

	add() {
		const layer = new Layer();
		this.layers.push(layer);
		layer.moveUpButton.addEventListener('click', () => {
			this.moveUp(layer);
		});
		layer.moveDownButton.addEventListener('click', () => {
			this.moveDown(layer);
		});
		layer.deleteButton.addEventListener('click', () => {
			layer.remove();
			this.delete(layer);
		});
		
	}

	delete({layer}) {
		const index = this.layers.indexOf(layer);
		if (index > -1) {
			this.layers.splice(index, 1);
		}
	}

	switchIndex({index1, index2}) {
		const temp = this.layers[index1];
		this.layers[index1] = this.layers[index2];
		this.layers[index2] = temp;
		this.refresh();
	}

	mergeIndex({index1, index2}) {
		this.layers[index1].add(this.layers[index2]);
		this.delete(this.layers[index2]);
		this.refresh();
	}

	moveUp = function({layer}) {
		const index = this.layers.indexOf(layer);
		if (index === 0 || index === this.layers.length - 1) return;
		this.switchIndex({index1: index, index2: index + 1});
	}

	moveDown = function({layer}) {
		const index = this.layers.indexOf(layer);
		if (index === 0 || index === 1) return;
		this.switchIndex({index1: index, index2: index - 1});
	}

	mergeUp = function({layer}) {
		const index = this.layers.indexOf(layer);
		if (index === 0 || index === this.layers.length - 1) return
		this.mergeIndex({index1: index, index2: index + 1});
	}

	mergeDown = function({layer}) {
		const index = this.layers.indexOf(layer);
		if (index === 0 || index === 1) return;
		this.mergeIndex({index2: index, index1: index - 1});
	}

	refreshEasel() {
		this.easelElement.innerHTML = '';
		this.layers.forEach(layer => {
			console.log("test");
			this.easelElement.appendChild(layer.drawCanvas);
			this.easelElement.appendChild(layer.selectCanvas);
		});
	}

	refreshControllers() {
		this.controllersElement.innerHTML = '';
		this.layers.forEach(layer => {

			const controllerElement = document.createElement('div');
			controllerElement.className = 'layer-controller';

			const previewElement = this.layers.previewElement;
			previewElement.addEventListener('click', () => {
				this.activeIndex = this.layers.indexOf(layer);
			});
			controllerElement.appendChild(previewElement);

			const moveButtons = document.createElement('div');
			moveButtons.classList.add('button');
			moveButtons.classList.add('layer-move-buttons');
			moveButtons.className = 'layer-move-buttons';

			const moveUpButton = document.createElement('div');
			moveUpButton.classList.add('button');
			moveUpButton.classList.add('layer-move-button');
			moveUpButton.innerHTML = '<i class="fa-solid fa-arrow-up"></i>';
			moveUpButton.addEventListener('click', () => {
				this.moveUp({layer});
			});

			moveButtons.appendChild(layer.moveUpButton);

			const moveDownButton = document.createElement('div');
			moveDownButton.classList.add('button');
			moveDownButton.classList.add('layer-move-button');
			moveDownButton.innerHTML = '<i class="fa-solid fa-arrow-down"></i>';
			moveDownButton.addEventListener('click', () => {
				this.moveDown({layer});
			});

			layer.moveButtons.appendChild(layer.moveDownButton);

			layer.controllerElement.appendChild(layer.moveButtons);

			const mergeButtons = document.createElement('div');
			mergeButtons.classList.add('button');
			mergeButtons.classList.add('layer-merge-buttons');
			mergeButtons.className = 'layer-merge-buttons';

			const mergeUpButton = document.createElement('div');
			mergeUpButton.classList.add('button');
			mergeUpButton.classList.add('layer-merge-button');
			mergeUpButton.innerHTML = '<i class="fa-solid fa-angles-up"></i>';
			mergeUpButton.addEventListener('click', () => {
				this.mergeUp({layer});
			});

			mergeButtons.appendChild(layer.mergeUpButton);

			layer.controllerElement.appendChild(layer.mergeButtons);

			const deleteButton = document.createElement('div');
			deleteButton.classList.add('button');
			deleteButton.classList.add('layer-delete-button');
			deleteButton.innerHTML = '<i class="fa-solid fa-trash-can"></i>';
			deleteButton.addEventListener('click', () => {
				this.delete({layer});
			});

			layer.controllerElement.appendChild(layer.deleteButton);

		});
	}

	refreshPreviews() {
		this.layers.forEach(layer => {
			layer.refreshPreviewElement();
		});
	}

	refresh() {
		console.log("test");
		this.refreshEasel();
		this.refreshControllers();
		this.refreshPreviews();
	}

}